Sounds good as is, but I would try pulling back the reverb overall and maybe taking it off the vocals altogether. Sometimes a dry vocal against a wet background provides a nice contrast. (Witness half the country songs ever recorded.)
The slide guitar worked well in this tune. Good idea there.
I once entertained the notion of writing an entire album based on the poetry from
Taliessin Through Logres. If I was a better singer I might have done it. But it's nice that you're doing something from the Grail tradition if I can't!